Queries :: Make A Union Query

I have two basic lists of employee names, ID's, phone numbers etc, with one field containing an attachment with a picture of their ID. I don't want to permanently combine these two lists of employees, as they work in different departments, but for certain events I need to be able to print a report with a list of all their names, ID numbers, and corresponding ID photos.

I tried to make a UNION query, but can't do it with the attachment field. If I leave that field out, it's no problem. To simplify, I have been doing a test run as follows, with just the name field and photo field (field 1).

SELECT [Starting Gate employees].[Employee name], [Starting Gate employees].Field2
FROM [Starting Gate employees]
UNION
SELECT [Farrier employees].[Employee name], [Farrier employees].Field2
FROM [Farrier employees];